Note: The job is a remote job and is open to candidates in USA. PayPay is a FinTech company that has grown to over 70M users since its launch in 2018. They are looking for a Backend Engineer to work on their payment system, focusing on delivering the best payment experience for customers while leveraging AI tools in their engineering processes.
Responsibilities
- Design large-scale systems with high complexity to support our high throughput applications
- Understand how to leverage infrastructure for solving such large-scale problems
- Develop tools and contribute to open source wherever possible
- Adopt problem solving as a way of life – always go to root cause! Support the code you write in production
- Leverage AI/LLM-based tools for code development, reviews, testing, and documentation in daily workflows
Skills
- 4+ years of experience in using Java under professional environment, or if you are non-Java user, excellent skills in generalized programming languages, such as Scala, Python, and Go
- Interest and ability to learn other coding languages as needed
- Experience with NoSQL databases and distributed cache
- Strong fundamentals in data structures, algorithms and object-oriented programming
- In-depth understanding of concurrency and distributed computing
- Degree in Computer Engineering or Computer Science or 5+ years equivalent experience in SaaS platform development
- Business level of English or Japanese
- Hands-on experience with AI/LLM tools (e.g., ChatGPT, GitHub Copilot, Gemini, CodeWhisperer, or similar) in professional software development
- Experience with implementing platform components such as RESTful APIs, Pub/Sub Systems, Database clients
- Experience with AWS services
- Experience in working for system development in finance, payment, or similar industries
- Experience in system design, development of web systems which handle massive amount of transactions or require scalability
- Language ability in Japanese and English is a plus (we have a professional translator but it is nice to have language skills)
- Experience in microservices
- Proven track record of integrating AI-assisted development into system design and delivery
- Contributions to AI-related open-source projects or automation of workflows with AI is a plus
Benefits
- Social Insurance (health insurance, employee pension, employment insurance and compensation insurance)
- 401K
- Translation/Interpretation support
- VISA sponsor + Relocation support
Company Overview